Device for repairing pneumatic tires.



G. W. BOYNTON. DEVICE FOR REPAIRING PNEUMATIC TIRES.

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APPLICATION EILED JAN. 23, I917- Patented Apr. 10, 1917.

LIDI I 9 avg/l f .272 z/zifiar' George W. Boynton GEORGE w. BOYNTON, or nosron, MASSACHUSETTS.

DEVICE FOR REPAIRING PNEUMATIC TIRES.

Specification of Letters Patent.

Patented Apr. 16 1917.

Application filed January 23, 1917. Serial No. 144,039.

To all whom it may concern:

Be it known that I, GEORGE W. BOYNTON, a citizen of the United States, residing at Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Devices for Repairing Pneumatic Tires, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to a device for repairing the inner tubes of pneumatic tires by vulcanizing or applying a patch thereto, and particularly to devices of this sort which include a work support on which the tire is placed, a patch-pressing element adapted to press the patch against the tire, and means for applying pressure to said patch-pressing element.

The objects of my invention are to provide an improved device of this type which is simple and inexpensive to manufacture,

which can be easily and quickly operated,

and which has other advantages, all as will be more fully hereinafter set forth.

In order to give an understanding of my invention, I have illustrated in the drawing a selected embodiment thereof which will now be described, after which the novel fea tures will be pointed out in the appended claim.

Figure 1 is a plan view of a device em bodying my invention;

Fig. 2 is a side view thereof;

=. Fig. 3 is a'sectional view on the line 3-3, Fig. 1.

1 indicates the frame of my device which is constructed to present a work-sup orting portion 2 on which the pneumatic tu e 4 to be repaired may be supported, and an overhanging arm 3. 5 indicates the patch-pressing element by which the patch 6 is pressed firmly against the tube 4. This patch-pressing element may be of any suitable construction and is herein shown as dish-shaped and as adapted to contain some combustible material 7 which when ignited will furnish sufficient heat to vulcanize the patch 6 in place.

In order to properly secure the patch 6 to the tube 4, it is necessary to apply considerable pressure thereto during the application "of the heat, and my present invention relates to a novel means for thus pressing the pressing element 5 firmly against the patch. The

end of the overhanging arm 3 is Shown as slotted, as at 8, and situated within the slot 8 and pivotally mounted to the arm at 10 is a cam-shaped element 9 by which the pressure is applied to the patch-pressing element 5. For transmitting the pressure from the cam to the element 5, I employ a skeleton shaped follower 11 having a plurality of arms, the ends 12 of which are adapted to rest on the rim 13 of the cup-shaped presser element 5. This follower 11 is provided with a block 14 having a groove 15 therein in which the cam'9 operates. The follower 11 is yieldingly held against the cam by means of a spring arm 16, one end of which is secured to the frame, as shown at 17, and to the other end of which the follower is rigidly secured. The resiliency of the spring arm 16 tends to lift the follower and thus to keep it in constant engagement with the cam 9. The cam 9 is provided with a handle 18 by which it may be operated.

In using the device, the cam is swung into its inoperative position, as shown in Fig. 3, and as this is done, the spring 16 raises the follower 11 to keep it in engagement with the cam. The inner tube 4 is then placed on the work-support 2 with the cemented patch 6 properly placed thereon and directly beneath the follower 11. The patch-pressing element 5 is then inserted beneath the follower 11 and in position to engage the patch 6. The lever 18 is then swung into the position shown in Fig. 2, and this operation will cause the cam face 19 to force the follower 11v downwardly, thus firmly pressing the patch-pressin element 5 against the patch. l he combusti le material 7 may then be ignited and the burning thereof will furnish sufficient heat to vulcanize the patch in place. When the vulcani zing process is completed the lever may be swung into the position shown in Fig. 3, thus unclamping the tube 4 which may then be removed. The operation of applying pressure to the patch and of relieving the pressure is the simple operation of swinging the lever 18 and because of the way in which the follower 11 is supported, said follower will be always yieldingly held in proper po ition without any attention on the part of tlie operator.

I claim:

In a device of the class described, the combination with a frame presenting a worksupporting portion and overhangin arm, secured at one end to the frame-and at the of a cam pivotally mounted in sai overother end to the follower and yieldingly hanging arm and rovided with an operatholding the follower against the cam.

ing handle, a patc -pressing element, a 01- In testimony whereof, I have signed my 10 5 lower interposed between the cam and the name to this specification.

patch-pressing element, and a spring arm GEORGE W. BOYNTON. 

